A reader asked the other day where I got some of the puzzles I put on here. (Okay, she asked about two weeks ago, but I don't check the email all that often.)

Many of the roughly pre-calculus level math questions come from the UVM Math Contest. The website has only the last dozen years but I have the Notebook that goes back to the 70s.

Some of the Old-Timey one are from Sam Loyd's Puzzle Encyclopedia. You can find many of them on Wikipedia but I downloaded the images of the original book from mathpuzzle.com/loyd or get the whole thing as a zip file.

## Tuesday, January 14, 2014

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